Abstract：
:We report the temperature dependence of the dielectric function ε = ε1 + iε2 and critical point (CP) energies of biaxial α-SnS in the spectral energy region from 0.74 to 6.42 eV and temperatures from 27 to 350 K using spectroscopic ellipsometry. Bulk SnS was grown by temperature gradient method. Dielectric response functions were obtained using multilayer calculations to remove artifacts due to surface roughness. We observe sharpening and blue-shifting of CPs with decreasing temperature. A strong exciton effect is detected only in the armchair direction at low temperature. New CPs are observed at low temperature that cannot be detected at room temperature. The temperature dependences of the CP energies were determined by fitting the data to the phenomenological expression that contains the Bose-Einstein statistical factor and the temperature coefficient for describing the electron-phonon interaction.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Nguyen HT,Le VL,Nguyen TMH,Kim TJ,Nguyen XA,Kim B,Kim K,Lee W,Cho S,Kim YDdoi
10.1038/s41598-020-75383-0subject
Has Abstractpub_date
2020-10-27 00:00:00pages
18396issue
1issn
2045-2322pii
10.1038/s41598-020-75383-0journal_volume
10pub_type
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